Two-way ball valve with cryogenic seat

Abstract

A two-way ball valve with cryogenic seat having a valve body ( 1 ) with inlet and outlet channels ( 2, 2 ′); a ball ( 3 ) with a through-hole ( 3.1 ); and at least one closing seat ( 4 ) in one of the channels ( 2, 2 ′) with a closing sealing gasket ( 5 ) against the wall ( 6 ) of the inner cavity where the ball ( 3 ) is arranged, the gasket ( 5 ) is in contact with the ball ( 3 ), the first end ( 5.2 ) having a first annular lip ( 5.21 ) in contact with the wall ( 6 ) through a first spring ( 8.1 ) to close the fluid passage from the first channel ( 2 ), and the second end having a second annular lip ( 5.31 ) in contact with the wall ( 6 ) through a second spring ( 8.2 ) to close the fluid passage from the second channel ( 2 ′).

The invention claimed is: 
     
       1. A two-way ball valve with a cryogenic seat, comprising:
 a valve body ( 1 ) with a first fluid inlet duct ( 2 ) and a second fluid outlet duct ( 2 ′), 
 a ball ( 3 ) with a through hole ( 3 . 1 ) arranged in an inner cavity of the valve body ( 1 ) between the inlet and outlet ducts ( 2 ,  2 ′), the ball ( 3 ) configured to rotate between a position connecting the through hole ( 3 . 1 ) to the inlet and outlet ducts ( 2 ,  2 ′) and a position which wherein it interrupts the passage between said inlet and outlet ducts ( 2 ), 
 a closing seat ( 4 ) arranged in the inlet duct ( 2 ) and/or in the outlet duct ( 2 ′), comprising a sealing gasket ( 5 ) inserted in a housing ( 7 ) defined in a wall ( 6 ) of the inner cavity where the ball ( 3 ) is arranged, the sealing gasket ( 5 ) comprising,
 an intermediate part ( 5 . 1 ) projecting from the housing ( 7 ) and contacting the ball ( 3 ) to close the passage of fluid through the contact between the sealing gasket ( 5 ) and the ball ( 3 ); 
 a first end ( 5 . 2 ) that defines a first chamber ( 7 . 1 ) of the housing ( 7 ) between the wall ( 6 ) and said first end ( 5 . 2 ), where there is arranged a first spring ( 8 . 1 ) of the closing seat ( 4 ) that presses a first annular lip ( 5 . 21 ) of the first end ( 5 . 2 ) of the sealing gasket ( 5 ) against the wall ( 6 ) to close the passage of fluid at the contact between the gasket ( 5 ) and the wall ( 6 ), establishing a passage of fluid from the inlet duct ( 2 ) to the first chamber ( 7 . 1 ) only between the wall ( 6 ) of the inner cavity of the valve body ( 1 ) and the sealing gasket ( 5 ), 
 
 
       wherein the sealing gasket ( 5 ) comprises a second end ( 5 . 3 ) that defines a second chamber ( 7 . 2 ) of the housing ( 7 ), between the wall ( 6 ) and said second end ( 5 . 3 ) where there is arranged a second spring ( 8 . 2 ) of the closing seat ( 4 ) that presses a second annular lip ( 5 . 31 ) of the second end ( 5 . 3 ) of the sealing gasket ( 5 ) against the wall ( 6 ) so that the passage of fluid is closed at the contact between the gasket ( 5 ) and the wall ( 6 ), establishing a passage of fluid from the outlet duct ( 2 ′) to the second chamber ( 7 . 2 ) only between the wall ( 6 ) of the inner cavity of the valve body ( 1 ) and the sealing gasket ( 5 ). 
     
     
       2. The two-way ball valve with a cryogenic seat according to  claim 1 , wherein the first annular lip ( 5 . 21 ) is arranged in the direction of the first duct ( 2 ) and the second annular lip ( 5 . 31 ) is arranged at an angle with respect to said first annular lip ( 5 . 21 ). 
     
     
       3. The two-way ball valve with a cryogenic seat according to  claim 1 , wherein the first end ( 5 . 2 ) comprises at least one inner recess ( 9 . 1 ) transverse to the gasket ( 5 ) that defines a permanent channel for the passage of fluid from the first duct ( 2 ) to the first chamber ( 7 . 1 ) when the first end ( 5 . 2 ) contacts the wall of the housing ( 7 ) in an area for the passage of fluid. 
     
     
       4. The two-way ball valve with a cryogenic seat according to  claim 1 , wherein the second end ( 5 . 3 ) comprises at least one outer recess ( 9 . 2 ) transverse to the gasket ( 5 ) that defines a permanent channel for the passage of fluid from the outlet duct ( 2 ′) to the second chamber ( 7 . 2 ). 
     
     
       5. The two-way ball valve with a cryogenic seat according to  claim 1 , wherein the second end ( 5 . 3 ) comprises a third annular lip ( 5 . 32 ) that contacts the wall ( 6 ) and, together with the second annular lip ( 5 . 31 ), delimits a housing for the second spring ( 8 . 2 ). 
     
     
       6. The two-way ball valve with a cryogenic seat according to  claim 5 , comprising a plurality of inner recesses ( 9 . 1 ) and/or a plurality of outer recesses ( 9 . 2 ) angularly equidistant from one another. 
     
     
       7. The two-way ball valve with a cryogenic seat according to  claim 6 , wherein the inner recesses ( 9 . 1 ) are arranged in angularly interspersed positions with respect to the outer recesses ( 9 . 2 ) in the axial direction with respect to the sealing gasket ( 5 ).